In theory I could place here a gazillion banner ads and ask for your e-mail adddress to send you interesting news letters to sell it for datamining and marketing.
So i'm still working on that one because money is the most important thing in the world.
For the hundreds of people e-mailing me banner exchanges, paid ads, to make the site better "seo"-d : they are still in my todo box because the whole purpose of a weblog is of course to make money.